How to draw a horizontal line passing through the given points?

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Poornima Gokhale 2015-12-17

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评论： Poornima Gokhale 2015-12-18

I have a word in which I have the row index of the first black pixel in the column and the row index of the last black pixel in the column. So I want to draw a horizontal line joining all the first black pixels and all the last black pixels so that i can get the size of the word from those lines. Please help me with the code. First pixels

last pixels

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Answer 1

Image Analyst 2015-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/260681-how-to-draw-a-horizontal-line-passing-through-the-given-points#answer_203543

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Let's say your image is called grayImage, and that your pixel columns are called "firstPixels" and "lastPixels" and of course you have your row indexes "firstRow" and "lastRow". So then just loop

for k= 1 : length(firstPixels)
    % Set row to zero for this word in the first row.
    grayImage(firstRow, firstPixels(k):lastPixels(k)) = 0;
    % Set row to zero for this word in the last row.
    grayImage(lastRow, firstPixels(k):lastPixels(k)) = 0;
end